توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Meat Quality and Lipid Oxidation of Pork after Dietary Supplementation with Oregano Essential Oil
اطلاعات انتشار: World Applied Sciences Journal، بيست و يكم،شماره۵، ۲۰۱۳، سال
تعداد صفحات: ۹
This study was carried out to determine the effects of diet supplementation with oregano (Lippia graveolens) essential oil (OEO) on meat quality and lipid oxidation in swine. A total of 48 pigs (Landrace × Yorkshire) was randomly assigned to one of four experimental groups during the finishing period. Each group was fed a commercial diet supplemented witheither 0 ppm (control), 1000 ppm, 2000 ppm or 3000 ppm OEO. Pigs were killed at 110 kg and meat quality was assessed over a 16 day storage period. With storage time, the water holding capacity of female meat increased (P 0.05) and the drip loss of both male and female meat decreased (P 0.001); OEO did not have a significant (P 0.05) effect on either factor. Lipid oxidation of meat from the 1000 ppm group was lower than that of control samples at any storage period. The addition of 1000 ppm OEO to pig diet could be recommended for the production of meat of good quality and minimum lipid oxidation.

۲A converse result concerning the periodic structure of commuting affine circle maps
اطلاعات انتشار: Journal of Nonlinear Sciences and Applications، نهم،شماره۷، ۲۰۱۶، سال
تعداد صفحات: ۲۰
We analyze the set of periods of a class of maps φd,κ : Z∆ →Z∆ defined by φd,κ(x) = dx+κ, d,κ ∈Z∆, where ∆ is an integer greater than 1. This study is important to characterize completely the period sets of alternated systems f,g,f,g,..., where f,g : S1 →S1 are affine circle maps that commute, and to solve the converse problem of constructing commuting affine circle maps having a prescribed set of periods.

۳Molecualr Cloning of the capsular antigen F1 of Yersinia pestis in pBAD\gIII plasmid
اطلاعات انتشار: Research in Pharmaceutical Sciences، دهم،شماره۱(پياپي ۲۸)، ۲۰۱۵، سال
تعداد صفحات: ۶
Yersinia pestis which is the causative agent of pneumonic plague and distributed in all continents has led to many deaths during the history. Because of its high mortality rate, it must be diagnosed and treated at the earliest time post infection and therefore, rapid diagnostic tests are required. In the present study, we cloned the coding sequence of F1 capsular antigen of the bacteria in the pBAD\gIII plasmid for later expression and purification of the protein to produce poly and monoclonal antibodies against this antigen, and subsequently to develop rapid and efficient diagnostics tools for Y. pestis infections.

۴A Conditional Test for Exponentiality Against Weibull DFR Alternatives Based on Censored Samples
نویسنده(ها): ، ،
اطلاعات انتشار: Journal of Iranian Statistical Society، سوم،شماره۱، ارديبهشت ، سال
تعداد صفحات: ۱۴
آزمونی بر پایه صورت درجه دوم با استفاده از نمونه‌های سانسوریده نوع 2 برای آزمون نمایی بودن در مقابل وایبول پیشنهاد شده است . نقاط درصدی و توان آزمون شبیه‌سازی شده ، داده شده‌اند . آزمون پیشنهادی برای شناسایی فرض مقابل نرخ شکست کاهشی وایبول حتی برای نمونه های کوچک خوب عمل می‌کند . مثالی نیز ارائه شده است .

۵Endemism in the reptile fauna of Iran
نویسنده(ها): ،
اطلاعات انتشار: Iranian journal of animal biosystematics، هفتم،شماره۱، ۲۰۱۱، سال
تعداد صفحات: ۱۸
Iran contains 36 named endemic reptile species in 17 genera and seven families. The most endemic and speciose family is the Gekkonidae, followed by the Lacertidae. These two families collectively dominate with 22 species (or 60.1%) of the total endemic herpetofauna. Twenty one endemics are known only from a single location or restricted area within a single physiographic region. An analysis of endemicity is given in terms of systematics and distribution.

۶The Lizard Fauna of Kurdistan Province, Western Iran
نویسنده(ها): ، ، ، ، ،
اطلاعات انتشار: Iranian journal of animal biosystematics، هشتم،شماره۱، ۲۰۱۲، سال
تعداد صفحات: ۲۰
Kurdistan Province in the western Iran possesses varied climatic and geographical conditions that led to rich biodiversity. An investigation on the status of lizards in this Province was carried out from June 2010 to September 2011. A total of 73 specimens were collected and identified. The collected specimens represented four families, 10 genera, and 14 species and subspecies, including Agamidae: Laudakia nupta nupta, Laudakia caucasia and Trapelus lessonae, Gekkonidae: Cyrtopodion scabrum, Asaccus kurdistanensis, Lacertidae: Eremias montanus, Eremias sp. (1) and Eremias sp. (2) (unknown taxa which may be related to E. persica complex), Apathya cappadocica urmiana, A. c. muhtari, Lacerta media media and Ophisops elegans, Scinicidae: Eumeces schneideri princeps and Trachylepis aurata transcaucasica. With respect to the data which was reported by Rastegar Pouyani et al. (2008) and Anderson (1999) Eremias sp. (1) and Eremias sp. (2) may belong to two new taxa, Apathya cappadocica muhtari is a new record from Iran, and also Eremias montanus is a new record from Kurdistan Province. The Lacertidae with six species, showed thehighest diversity among the families represented here.

۷The halophilic fairy shrimp, Phallocryptus spinosa (Milne–Edwards, 1840) (Crustacea: Branchiopoda: Anostraca) from southeast, Iran
نویسنده(ها): ، ، ،
اطلاعات انتشار: Iranian journal of animal biosystematics، هشتم،شماره۲، ۲۰۱۲، سال
تعداد صفحات: ۸
Phallocryptus spinosa (Milne–Edwards, 1840) was previously recorded in Iran from a shallow salty pond close to Tabriz, occurring sympatrically with Branchinecta orientalis Sars, 1901; Second and third locations were reported from similar habitats in central area and south of Iran from Bafq and Lar, respectively. Here, a forth population was found during sampling in a pool, about 2000 Km to the south of the first recorded locality. A global distribution map for P. spinosa is presented.

۸Evaluation of Remediation Methods for Soils Contaminated with Benzo ( a ) Pyrene
نویسنده(ها): ، ، ، ،
اطلاعات انتشار: International Journal Of Environmental Research، اول،شماره۴، Autuman ۲۰۰۷، سال
تعداد صفحات: ۶

۹Corporations Response to the Energy Saving and Pollution Abatement Policy
نویسنده(ها): ، ، ، ،
اطلاعات انتشار: International Journal Of Environmental Research، چهارم،شماره۴، Autumn۲۰۱۰، سال
تعداد صفحات: ۱۰
As the main actor of implementing energy saving and pollution abatement, corporations and their response to the policy are studied in this paper. We find that corporate properties as scale, ownership, current environmental performance on energy using and pollution, target market and listed situation have impact on the corporate responding conduct and progress. Especially, current environmental performance has strong relationship with corporate policy responding performance, corporations with low energy efficiency performed poorly to energy saving and those with heavy pollution level performed below average for pollution abatement. It implicates that the national policy could contribute a lot to outdating production facilities less environment–friendly under strict implementation.

۱۰Stormwater Quality from Gas Stations in Tijuana, Mexico
نویسنده(ها): ، ، ، ،
اطلاعات انتشار: International Journal Of Environmental Research، چهارم،شماره۴، Autumn۲۰۱۰، سال
تعداد صفحات: ۸
There are many potential sources of stormwater pollutants in urban areas; one of these sources is gas stations, which are numerous and spread city–wide. A study was conducted to evaluate the water quality of runoff from gas stations in the city of Tijuana, Mexico. Pollutant loads in runoff from gas stations in the study area were higher than in other published studies. The estimated loads from gas stations of oil and grease (OG), total suspended solids (TSS) and chemical oxygen demand (COD) were 39.9, 265.3 and 168.6 Kg\ha, respectively. These values of OG, TSS and COD were 57, 41 and 18 times higher than the values reported in another similar study conducted in the US. The possible reasons for these differences may lie in the different cleaning processes utilized in gas stations, in the mechanical conditions of the cars that enter the sites and the urban characteristics surrounding the gas stations. The results from this study show that runoff from gas stations can be a main contributor of pollutants such as suspended solids, heavy metals, oil and grease to stormwater and water bodies.

۱۱An Investigation on Heavy Metals in an Industrial Area in Greece
نویسنده(ها): ، ،
اطلاعات انتشار: International Journal Of Environmental Research، چهارم،شماره۴، Autumn۲۰۱۰، سال
تعداد صفحات: ۱۰
In the industrial area of Elefsis, Greece, aerosol samples from the atmosphere were collected using a stacked filter unit sampler, which separates the airborne particulate matter into coarse (PM2.5–10) and fine (PM2.5) size fractions. The samples collected during the period January 2005 to March 2006, were analyzed by anodic stripping voltammetry (ASV) and inductively coupled plasma atomic emission spectrometry (ICP–AES) to determine the fine and coarse particulate concentrations of the heavy metals Zn, Pb, Cd, Cu, Fe, Mn and Ni. Concerning the elements Pb, Cd and Ni regulated by the European Union, annual average concentrations were lower than the prospective assessment thresholds, while concentration levels of Mn were in compliance with the values proposed by the World Health Organization. The concentrations of PM10 particulates were about two times as that of the PM2.5 particulates. Additionally, the ratio of fine (PM2.5) to coarse (PM2.5–10) particle concentrations was 0.44, indicating enrichment in the coarse particulates. Fe and Zn concentrations were mostly in the coarse particulate mode. Furthermore, the Pb\Cd average ratio in coarse and fine airborne particulates suggests that Pb is emitted by car exhausts and mainly industrial sources. Moreover, correlation analysis between airborne particulate matter (PM) and toxic elements was carried out to investigate the sources that affect the presence of these elements in coarse and fine particulates.

۱۲Management of Urban Solid Waste Pollution in Developing Countries (Text in Persian)
نویسنده(ها): ، ،
اطلاعات انتشار: International Journal Of Environmental Research، چهارم،شماره۴، Autumn۲۰۱۰، سال
تعداد صفحات: ۱۲
Solid waste pollution، like the other environmental problems، is assuming serious dimensions in Delhi. From the last few decades، the study area has been experiencing a significant increase in the generation of solid waste that is adversely affecting its physical environment and is creating aesthetic problems. The current study reviews the data on the quantity of municipal solid waste generation، its physico–chemical characteristics، collection and disposal system. During the analysis it has been found that rapid populationgrowth in Delhi has enhanced the rate of generation of solid wastes manifolds. Consequently، the management of waste has become Herculean work، and، piles of garbage and waste of all kinds littered everywhere have become a common site. The present analysis highlighted that the existing system of waste collection and its disposal within the municipal board is not only inadequate and insufficient but also unscientific. It has been tried to develop a strategy for mitigating and managing this problem in the sustainable urban development perspectives by involving Non–Government and Community–Based Organizations. Besides، the analysis also provides a background for the discussion of strategic issues relating to how these organizations in Delhi can assist the local government in solving the waste management crisis.

۱۳Effect of the Ammonium ChlorideConcentration on the Mineral Medium Composition – Biodegradation of Phenol by a Microbial Consortium
نویسنده(ها): ، ، ، ، ، ،
اطلاعات انتشار: International Journal Of Environmental Research، چهارم،شماره۴، Autumn۲۰۱۰، سال
تعداد صفحات: ۶
Phenol and its homologues are aromatics containing hydroxyl, methyl, amide and sulphonic groups attached to the benzene ring. These molecules are both anthropogenic and xenobiotics. Phenols are environmental pollutants discharged through wastewaters from various industries. Phenols are toxic to several biochemical reactions. However biological transformation of phenols to non–toxic entities exists in specialized microbes, owing to enzymatic potential involving enzymes of aromatic catabolic pathways. In this study, a series of experiments were performed to examine the effects of the mineral medium composition and the pH on phenol removal. In this purpose, phenol biodegradation was carried out in a batch reactor containing mixed bacteria; the temperature (30°C), the stirring velocity (200 r \min) and the phenol concentration (125 mg\L) were kept constants. The initial pH was varied in the range 5 – 9 and the mineral components were tested in the following concentration ranges: 0 – 2 g\L for NH4Cl, 0 – 4 g\L for KH2PO4, 0 – 4 g\L for NaH2PO4 and 0 – 0.2 g\L for MgSO4. Their effects on phenol biodegradation and specific growth rate were examined. All experiments were carried out at a given initial bacterial concentration of 0.08 g\L (based on optical density determination, 0.079). The shorter biodegradation time of phenol was 20.6 h for NaH2PO4, KH2PO4 and MgSO4 concentrations of 2 – 4, 3 and 0.2 g\L respectively. Maximum specific growth rate (0.65 h–1) and total phenol removal (99.99 %) were recorded for an optimal pH value of 8 and the following mineral medium concentrations (g\L): 1, 4, 3 and 0.1 for NH4Cl, KH2PO4, NaH2PO4 and MgSO4 respectively.

۱۴Effect of the Ammonium ChlorideConcentration on the Mineral Medium Composition – Biodegradation of Phenol by a Microbial Consortium
نویسنده(ها): ، ، ، ، ، ،
اطلاعات انتشار: International Journal Of Environmental Research، چهارم،شماره۴، Autumn۲۰۱۰، سال
تعداد صفحات: ۶
Phenol and its homologues are aromatics containing hydroxyl, methyl, amide and sulphonic groups attached to the benzene ring. These molecules are both anthropogenic and xenobiotics. Phenols are environmental pollutants discharged through wastewaters from various industries. Phenols are toxic to several biochemical reactions. However biological transformation of phenols to non–toxic entities exists in specialized microbes, owing to enzymatic potential involving enzymes of aromatic catabolic pathways. In this study, a series of experiments were performed to examine the effects of the mineral medium composition and the pH on phenol removal. In this purpose, phenol biodegradation was carried out in a batch reactor containing mixed bacteria; the temperature (30°C), the stirring velocity (200 r \min) and the phenol concentration (125 mg\L) were kept constants. The initial pH was varied in the range 5 – 9 and the mineral components were tested in the following concentration ranges: 0 – 2 g\L for NH4Cl, 0 – 4 g\L for KH2PO4, 0 – 4 g\L for NaH2PO4 and 0 – 0.2 g\L for MgSO4. Their effects on phenol biodegradation and specific growth rate were examined. All experiments were carried out at a given initial bacterial concentration of 0.08 g\L (based on optical density determination, 0.079). The shorter biodegradation time of phenol was 20.6 h for NaH2PO4, KH2PO4 and MgSO4 concentrations of 2 – 4, 3 and 0.2 g\L respectively. Maximum specific growth rate (0.65 h–1) and total phenol removal (99.99 %) were recorded for an optimal pH value of 8 and the following mineral medium concentrations (g\L): 1, 4, 3 and 0.1 for NH4Cl, KH2PO4, NaH2PO4 and MgSO4 respectively.

۱۵Vertical Distribution of Heavy Metals and Enrichment in the South China Sea Sediment Cores
نویسنده(ها): ، ، ، ، ، ، ، ،
اطلاعات انتشار: International Journal Of Environmental Research، چهارم،شماره۴، Autumn۲۰۱۰، سال
تعداد صفحات: ۱۰
Forty seven sediment cores recovered from the South China Sea coasts along the east coast of Peninsular Malaysia were analysed for As, Cd, Cr, Cu, Hg, Ni, Pb and Zn using instrumental neutron activation analysis. The results indicate a homogeneous distribution except for As and Pb in all stations. Assessment of heavy metal pollution in marine sediments requires knowledge of pre–anthropogenic metal concentrations to act as a reference against which measured values can be compared. Primitive values for the cored sediments were determined from shale average metal. Various methods for calculating metal enrichment and contamination factors are reviewed in detail and a modified and more robust version of the procedure for calculating the degree of contamination is proposed. The revised procedure allows the incorporation of a flexible range of pollutants, including various organic species, and the degree of contamination is expressed as an average ratio rather than an absolute summation number. Comparative data for normalized enrichment factors and the modified degree of contamination show that the South China Sea sediments are in uncontaminated to moderately contaminated level of heavy metal contamination. Compared to obtained values the Kelantan and Pahang big rivers mouth show higher enrichment averaged across other sites.

۱۶Environmental Behavior and Water Saving in Spanish Housing
اطلاعات انتشار: International Journal Of Environmental Research، پنجم،شماره۱، Winter ۲۰۱۱، سال
تعداد صفحات: ۱۰
Environmental matters are becoming a question of great importance and the increased attention to such matters has helped to make businesses, politicians and society in general consider the environment a matter of priority concern. Environmental concern, taken to mean an attitude favourable to the environment, has become widespread in different environmental aspects, such as energy saving, water consumption reduction, or rubbish separations. However, economic and political interests are sometimes confronted with environmental interests, so a change in society’s behavior with regard to the use of natural resources is necessary to ensure their future and that future generations can enjoy them, in order to fulfil the concept of sustainability introduced by the Rio summit of 1992. So the aim of this study is to analyse the water–saving behavior of Spanish households and identify the variables influencing its development.

۱۷Analysis of the Environmental Projects Risk Management Success Using Analytical Network Process Approach
نویسنده(ها): ، ، ،
اطلاعات انتشار: International Journal Of Environmental Research، پنجم،شماره۲، Spring ۲۰۱۱، سال
تعداد صفحات: ۸
It is commonly recognized that knowledge is the only source of core competence of Environmental Projects in the knowledge based companies, but the productivity rate of knowledge workers is always Low. Based on knowledge workers’ characteristics, in this paper, we seek to identify knowledge workers factors influencing on the Environmental Projects Risk Management success (EPRM), then Knowledge strategies present for EPRM Success. Finally, the best strategy selects using Analytical Network Process (ANP) approach. It is hoped that this paper will help Environmental Projects managers to implement different corresponding measures. A case study is presented where this model measures and validates at the Daru– Pakhsh Company.

۱۸Quality Management of Water Distribution Networks by Optimizing Dosage and Location of Chlorine Injection
نویسنده(ها): ، ، ، ، ،
اطلاعات انتشار: International Journal Of Environmental Research، پنجم،شماره۲، Spring ۲۰۱۱، سال
تعداد صفحات: ۱۲
A methodology is presented in this paper to find optimal location and dosage of chlorine injection in water distribution networks. The objective is to minimize the chlorine consumption while keeping the residual chlorine at each node within the standard range. Unfortunately because of wrong water quality management in water distribution networks in many parts of the world, many problems such as bacterial growth or formation of by–products occur in these systems. In this paper with integrating two models, hydraulic model of EPANET2 with ability of quality simulation and optimization model of Genetic Algorithm (GA), the best locations for chlorine injection and its optimum dosage in the water networks are obtained. To evaluate the presented method, two test examples are studied. The results of this study show the reduction in total consumed chlorine in the system obtained by chlorine injection in optimal locations with optimum dosage, in comparison with other researches.

۱۹The Role of Economic Policy and Environment in Sustainable Development
نویسنده(ها): ،
اطلاعات انتشار: International Journal Of Environmental Research، پنجم،شماره۲، Spring ۲۰۱۱، سال
تعداد صفحات: ۸
Economic policies need to be analyzed within consistent and coherent framework. In the absence of an operational framework the policy analyst is confronted with an indeterminate model to work with. This paper intends to offer a specific framework for economic–environment integration to highlight the role of economic policy and environment in sustainable development for the purpose of empirical analysis and hypothesis testing. The term was used by the Brundtland report coined what has become the most often–quoted definition of sustainable development as development that “meets the needs of the present without compromising the ability of future generations to meet their own needs. Sustainable development is a multidimensional and multidisciplinary concept that has been emerged from a number of disciplines including economics, ecology, ethics, sociology and political sciences. This notion links the welfare of generations with the capacity of the biosphere to sustain life. Sustainable development is not a fixed state but rather a process of change in which resource exploitation, the direction of investment, the orientation of technological development and institutional change are made consistent with the future as well as present needs. This report does not consider the range of policy instruments that could be used in achieving sustainable development outcomes, but focuses on a specific framework for economic– environment integration with emphasis on the “social” component of sustainable development.

۲۰Impact of Innovative Practices in Environmentally Focused Firms: Moderating Factors
نویسنده(ها): ، ، ، ، ، ، ، ، ، ، ، ،
اطلاعات انتشار: International Journal Of Environmental Research، پنجم،شماره۲، Spring ۲۰۱۱، سال
تعداد صفحات: ۱۰
Innovation and sustainable development have been considered fundamental elements in the competitive positioning of companies. The synergies between both concepts, known as eco–innovation, must be considered when designing company policies. The aim of this paper is to analyse which moderating factors determine how innovative companies perform when implementing a sustainable proactive approach. We analysed a representative sample of Spanish companies using a quantitative method based on data collected from the PITEC database. The empirical results show that company and market size, formal innovative activity (reflected by registered numbers of patents) as well as total expenditure on technology acquisition influence the eco–innovative orientation of firms.

۲۱Asbestos Concentrations and Lung Restrictive Patterns
نویسنده(ها): ، ، ،
اطلاعات انتشار: International Journal Of Environmental Research، پنجم،شماره۲، Spring ۲۰۱۱، سال
تعداد صفحات: ۶
Asbestos applications were limited during past two decades in developed nations due to its debilitating health problems, while in developing countries it’s various usages continues. The main goals of present study were evaluation of asbestos concentrations in ambient outdoor and indoor air and occupational exposure, as well as exposure effects on pulmonary function. Sampling procedure was carried out during May and June 2010 at four outdoor and seven indoor air sampling stations. Ten persons were selected based on their exposure limits including high, moderate and low exposure. Also to assess pulmonary function of workers, 42 spirometry cases were tested. Samples were analyzed by SEM with EDXA. Obtained results revealed that average concentrations of asbestos fibers were 1.885×10–5 f\mL and 0.065 f\mL in outdoor and indoor air, respectively. Occupational exposure contents were between 1.5 ×10–5 – 0.2 f\mL (based on exposure limits). Spirometry tests showed that 28% of workers had impaired lung functions. Lung restrictive pattern in workers were 2% severe, 12% moderate and 14%. Results showed pattern of fibrous particles as actinolite> termolite> chrysotile in indoor air. Generally, it is clear that there is positive meaningful relationship between more than ten occupational ages and malfunction of lungs in studied workers due to asbestos effects.

۲۲Environmental Cost of Groundwater: A contingent Valuation Approach
نویسنده(ها): ، ، ،
اطلاعات انتشار: International Journal Of Environmental Research، پنجم،شماره۳، Summer ۲۰۱۱، سال
تعداد صفحات: ۱۰
The Water Framework Directive of the European Union has become a milestone in the water policy for this area. This Directive aims to achieve a “good ecological status” of bodies of water in the Member States of the European Union by 2015. The Water Framework Directive calls for the application of economic principles, economic approaches, tools and instruments. The functions of this economic analysis include identifying methods to estimate resource and environmental costs. The purpose of this paper is to define the applications of Environmental Economics techniques in a groundwater valuation, taking the Gavilán Aquifer, located in the southeast of Spain, as a case study. This aquifer discharges support a very important wetland, with high biological, recreational and landscaping values. As this groundwater is also used for agricultural purposes, it is an ideal case to test a methodology aimed at measuring both environmental and resource costs. Two valuation techniques % Contingent Valuation Method and Production Function Approach% were applied so as to achieve this goal. The total economic value estimated for this groundwater is 0.454 €\m3, out of which 16.1% is related to environmental and recreational aspects.

۲۳Impact of a Mixed Industrial and Domestic Wastewater Effluent on the Southern Coastal Sediments of Sfax (Tunisia) in the Mediterranean Sea
نویسنده(ها): ، ، ، ، ، ، ، ، ،
اطلاعات انتشار: International Journal Of Environmental Research، پنجم،شماره۳، Summer ۲۰۱۱، سال
تعداد صفحات: ۱۴
Concentrations of Zn, Cu, Cr, Cd, Pb and Fe in surface marine sediments of the southern coast of Sfax were studied in order to understand current metal contamination at the outlet of a mixed industrial and domestic wastewater effluent discharged into the seawater since 1953. We found that heavy metal concentrations (mg\kg dry weight) in surface marine sediments varied from 42 to 391 for Zn, 15 to 44 for Cu, 44 to 137 for Cr, 6 to 56 for Cd, 19 to 59 for Pb and 52344 to 54543 for Fe. The computed metal enrichment factors (EF) in the sediments showed that EF of Zn ranged from 0.49 to 9.13, EF of Cu from 0.35 to 3.04, EF of Cr from 0.3 to 3.05, EF of Cd from 0.63 to 9.37 and EF of Pb from 0.43 to 3. All heavy metals were characterized by maxima EF values greater than 1.5, indicating a considerable metallic pollution of the study area. The PCA analysis revealed two distinct groups: (i) the first group (G1) is representative of Fe selected as natural tracer and (ii) the second group (G2) is articulated around Zn, Cu, Cr, Cd and Pb. These metals which did not show any correlations with Fe of the first group imply a significantly impact of the selected wastewater effluent. The calculation of the geoaccumulation index (Igeo) showed that all analyzed metals (except for Fe) can be considered as moderate to extreme pollutants. The microbial analysis of seawater samples and also of both water and sediment samples collected from the Sfax solar saltern (placed at the vicinity of the outlet of the selected effluent) showed that no indicator germs of contamination (total coliforms, faecal coliforms and faecal streptococci) were detected.

۲۴Impact of a Mixed Industrial and Domestic Wastewater Effluent on the Southern Coastal Sediments of Sfax (Tunisia) in the Mediterranean Sea
نویسنده(ها): ، ، ، ، ، ، ، ، ،
اطلاعات انتشار: International Journal Of Environmental Research، پنجم،شماره۳، Summer ۲۰۱۱، سال
تعداد صفحات: ۱۴
Concentrations of Zn, Cu, Cr, Cd, Pb and Fe in surface marine sediments of the southern coast of Sfax were studied in order to understand current metal contamination at the outlet of a mixed industrial and domestic wastewater effluent discharged into the seawater since 1953. We found that heavy metal concentrations (mg\kg dry weight) in surface marine sediments varied from 42 to 391 for Zn, 15 to 44 for Cu, 44 to 137 for Cr, 6 to 56 for Cd, 19 to 59 for Pb and 52344 to 54543 for Fe. The computed metal enrichment factors (EF) in the sediments showed that EF of Zn ranged from 0.49 to 9.13, EF of Cu from 0.35 to 3.04, EF of Cr from 0.3 to 3.05, EF of Cd from 0.63 to 9.37 and EF of Pb from 0.43 to 3. All heavy metals were characterized by maxima EF values greater than 1.5, indicating a considerable metallic pollution of the study area. The PCA analysis revealed two distinct groups: (i) the first group (G1) is representative of Fe selected as natural tracer and (ii) the second group (G2) is articulated around Zn, Cu, Cr, Cd and Pb. These metals which did not show any correlations with Fe of the first group imply a significantly impact of the selected wastewater effluent. The calculation of the geoaccumulation index (Igeo) showed that all analyzed metals (except for Fe) can be considered as moderate to extreme pollutants. The microbial analysis of seawater samples and also of both water and sediment samples collected from the Sfax solar saltern (placed at the vicinity of the outlet of the selected effluent) showed that no indicator germs of contamination (total coliforms, faecal coliforms and faecal streptococci) were detected.

۲۵Removal of Lead and Cadmium Ions From Aqueous Solutions Using Dried Marine Green Macroalga (Caulerpa racemosa)
نویسنده(ها): ، ، ، ، ، ، ،
اطلاعات انتشار: International Journal Of Environmental Research، پنجم،شماره۳، Summer ۲۰۱۱، سال
تعداد صفحات: ۸
In this study Caulerpa racemosa has been characterized and used for the removal of Cd(II) and Pb (II) from aqueous solutions. The effect of pH, adsorbent dosage, contact time and temperature on adsorption process was studied in batch experiments. Langmuir and Freundlich models were applied to describe the biosorption isotherm of the metal ions by C. racemosa biomass. The adsorption data can be well described by Langmuir isotherm. The monolayer biosorption capacity of C. racemosa biomass for Pb(II) and Cd(II) ions was found to be 34.5 mg\g and 29 mg\g, respectively. Kinetics data of both metal ions were best described by pseudo second order model.The thermodynamic studies indicated that the adsorption was spontaneous and exothermic in nature. The analysis with FTIR indicated that possible functional groups involved in metal sorption by this alga were O–H bending, N–H stretching, C–N stretching, C–O and S=O stretching.
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